Minimizing nitrous oxide in biological nutrient removal from municipal wastewater by controlling copper ion concentrations.
Appl Microbiol Biotechnol
; 97(3): 1325-34, 2013 Feb.
Article
em En
| MEDLINE
| ID: mdl-22419216
ABSTRACT
In this study, nitrous oxide (N(2)O) production during biological nutrient removal (BNR) from municipal wastewater was reported to be remarkably reduced by controlling copper ion (Cu(2+)) concentration. Firstly, it was observed that the addition of Cu(2+) (10-100 µg/L) reduced N(2)O generation by 54.5-73.2 % and improved total nitrogen removal when synthetic wastewater was treated in an anaerobic-aerobic (with low dissolved oxygen) BNR process. Then, the roles of Cu(2+) were investigated. The activities of nitrite and nitrous oxide reductases were increased by Cu(2+) addition, which accelerated the bio-reductions of both nitrite to nitric oxide (NO (2) (-) â NO) and nitrous oxide to nitrogen gas (N(2)O â N(2)). The quantitative real-time polymerase chain reaction assay indicated that Cu(2+) addition increased the number of N(2)O reducing denitrifiers. Further investigation showed that more polyhydoxyalkanoates were utilized in the Cu(2+)-added system for denitrification. Finally, the feasibility of reducing N(2)O generation by controlling Cu(2+) was examined in two other BNR processes treating real municipal wastewater. As the Cu(2+) in municipal wastewater is usually below 10 µg/L, according to this study, the supplement of influent Cu(2+) to a concentration of 10-100 µg/L is beneficial to reduce N(2)O emission and improve nitrogen removal when sludge concentration in the BNR system is around 3,200 mg/L.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Compostos Orgânicos
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Cobre
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Águas Residuárias
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Compostos Inorgânicos
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Óxido Nitroso
Idioma:
En
Revista:
Appl Microbiol Biotechnol
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
China